Is there any 64 bit content (wdx) plugin available for retreiving tag informations of audio files like mp3, ogg, acc, flac?

The only one I've found is the very minimalistic id3 from Christian Ghisler which is only capable of handling mp3 files and understands id3v1 tags only. Editing of tag attributes isn't supported either.

The combined 32/64 bit version (currently 0.7.1 beta) can be downloaded here

Loopback also integrated the wlx in the wdx you might need to manually add the wdx in lister.

btw there is a new mediainfo based plugin (32&64) on totalcmd.net
http://www.totalcmd.net/plugring/MediaInfoWDX.html
but the author compiled it with the /MDD so it needs the debugging vc 11 dll's those can't be found outside visual studio 11, if he's reading this, please recompile with /MD or /MT.

in the latest update MediaInfoWDX
http://www.totalcmd.net/plugring/MediaInfoWDX.html
has been properly linked with the release crt, and there is a static version that doesn't need the vc11 crt dll's. But it's been linked with a minimal required OS set to 6.0 it won't work on XP, there is no need for this as VC11SP1 Supports XP, TC runs on XP and MediaInfo.dll also runs nicely on XP, it's a nice alternative but it doesn't work on XP and I prefer loopback's plugin as it's custimizable via an external xml file, loopback's added a 64 bit version in his last beta 0.71 see X-Byte's links.

The combined 32/64 bit version (currently 0.7.1 beta) can be downloaded here

Found this after Google Translate helping me to understand the related thread.

I don't know why it was so hard to find this thread and solution, but I can confirm that even on Windows 10 Build 1703 with TC 9.0a 64bits the combined 32/64bits TCMediaInfo is still and perfecly working ! Thank you for this complete answer, X-Byte !
PS: and as far as I'm concerned, it also works like a breeze with video files, as one may expect.